Ventilator for window-sashes



E. W. GHADWIGK.

VBNT'ILATOI; PQR WINDOW sAsHBs.

F151' Patented Qpmegjfl. 1883.

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UNITED STATES PATENT OFFICE.,

EDWARD VELLS CHADWIQK, OF EDGARTOWN, MASSACHUSETTS.

VENTILATOR FOR 'WINDOW-SASHESQ SPECIFICATION forming part of Letters Patent No. 289,387, dated December 4, 1883.

applicati@ flied May 22, 1883. (No model.)

To all whom it may concern:

Beit known that I, EDWARD VELLs OHADT WICK, of Edgartown, in the county of Dukes, of the Commonwealth of Massachusetts, have invented a `newand useful Improvement in Ventilators for Vindow Sashes; and I do hereby declare .the same to be described in the following specification, and represented in the accompanying drawings, of which- Figure l is an elevation, and FiO. 2 a transverse section7 of a window-frame and its two sashes provided with my invention. Fig. 3 is a horizontal section of the bottom bar of the lower sash. Fig. l is a top view, Fig. 5 a horizontal section, Fig. 6 a transverse section, and Figs. 7 and 8 opposite side views, of the ventilator separate from the sashes.

This ventilator is to be applied to one or each of the sashes A and B, it being adapted to the upper bar of the upper sash and the lower bar of the lower sash. It consists of a foraminous plate, C, a perforated plate, D, a perforated slide or valve, E, a spiral spring, F, and a knob, G, arranged and combined as represented. The valve E is a plate adapted to slide in guides a against the rear face of the plate D, which has in it a series of holes, b, arranged at equal distances apart and corresponding in number and size and distances apart with another such series of holes, c, made The shank d of the knob Gr extends through a slot, e, made in the foraminous plate C, lengthwise thereof, and is fastened to the valve. The said shank is circumscribed by the spiral spring F, which at one end bears against the plate C and at' the other against the valve, in order to force the latter closely to its seat. Ihe plate C is fixed or secured tothe sash-bar on its inner side, and the plate D is fixed or secured to such sash-bar on its outer side, and between the two plates there is a slot or opening, H, through the sash-bar, such opening having a vertical section as wide as the plate D and a length nearly equal to that of such plate, the same being to admit of the valve being moved to cover or uncover the openings in the plate D, and to allow air passing into and through such openings tofreely pass to and through the openings of the plate C.

To the knob of the ventilator of the upper sash two cords, g g', provided with tassels, may be affixed, and lead in opposite directions from the knob to and through eyes la, h in the sash near its upper corners, such cords being for operating the valve. By pulling on one cord the valve will be moved in one direction, and by pulling on the other cord such cord may be moved the opposite way.

By means of the ventilators in the two sashes a room may be ventilated by currents of fresh air let into it through the lower sash, the vitiat-ed orV heated air escaping through the ventilator of the upper sash.

I claimi l. The ventilator, substantially as described, consisting of the foraminous plate C, perforated plate D, perforated slide or valve E, lthe knob G, and the spiral spring F, arranged and adapted essentially and for application to a window-sash, in manner as set forth;

2.. The window-sash having in its bar a slot, H, in combination with a ventilator, substau` tially as described, applied to such slot, such ventilator consisting ofthe perforated plate D, foralninous plate C, perforated slide or valve E, the knob G, and the spiral spring F, arranged and adapted essentially as set forth.

EDWARD W'ELLS CHADWIGK.

Titnesses R. H. EDDY, E. B. PRATT. 

